Amon Dîn was perhaps the oldest of the beacon hills, originally used as a fortified outpost of Minas Tirith. It kept watch over the passage into North Ithilien from Dagorlad and any attempt by enemies to cross the Anduin near Cair Andros.[1][2]

In the late Third Age, the eastward side of Amon Dîn was covered with wide grey thickets.[3]

Etymology

Amon Dîn is Sindarin, meaning "silent hill" (amon + dîn).[4][2] Probably it refers to its distinct rocky and barren appearance standing out and isolated from the heavily wooded hills of the Drúadan Forest.